Mysterious Fast Radio Bursts May Be Occurring Every Second

Fast radio bursts are quite the ongoing space mystery. We don't know what they are, and only a couple of dozen sources have ever been detected by radio telescopes.

But they may not be as rare as we think - they could be firing off as frequently as once a second over the entire observable universe.

"If we are right about such a high rate of FRBs happening at any given time, you can imagine the sky is filled with flashes like paparazzi taking photos of a celebrity," said lead researcher Anastasia Fialkov of the Harvard-Smithsonian Center for Astrophysics.

"Instead of the light we can see with our eyes, these flashes come in radio waves."

Most fast radio burst sources are only detected once. They are extremely powerful radio bursts that last just milliseconds. They can't be predicted, and because they are so short and unrepeating, tracking them to their source or trying to figure out what causes them is all but impossible.

However, there's one notable exception. FRB 121102, which was first detected in 2002. It has fired an incredible 34 bursts over the years, which has allowed researchers to pin down its location to a galaxy 3 billion light-years away.

The Square Kilometre Array, being built across Australia, New Zealand and South Africa, will be much more powerful, and will also include a low-frequency aperture array that will be able to detect the very low frequency signals between 50 and 350MHz.

"In the time it takes you to drink a cup of coffee, hundreds of FRBs may have gone off somewhere in the Universe," Loeb said. "If we can study even a fraction of those well enough, we should be able to unravel their origin."

Whatever they are, they could, the researchers say, help unveil clues as to the origin of the universe and the Epoch of Reonisation, wherein the interstellar medium, primarily hydrogen, became ionised in the very early universe. We still don't know how that happened, either.

"FRBs are like incredibly powerful flashlights that we think can penetrate this fog [of the interstellar medium] and be seen over vast distances," said Fialkov. "This could allow us to study the 'dawn' of the universe in a new way."